Blizzard Entertainment offers downloads of Overwatch for Windows for $29.99. That's tied with our December mention of the Origins Edition as the lowest price we've seen for a PC version of this team shooter. (It's also $12 under the best deal we could find for the Origins Edition elsewhere.)
Note: It's also available in Game of the Year Edition for $39.99. That's $20 off list and the lowest price we could find.